JPS6297137A - Recording and reproducing method for optical information - Google Patents

Abstract

PURPOSE:To improve the recording reliability of information by securing such as constitution where the 2nd spot detects the correction of the information recording surface prior to the 1st spot when the 1st spot records the information and the 3rd spot following the 1st spot reproduces the information recorded by the 1st spot. CONSTITUTION:The 2nd spot 21 detects the state of a track 28 before the 1st spot 18 records the information on the track 28 and then detects an inadequate case where the information is already recorded. Thus a prescribed command is delivered from a check data reading circuit 27. Then a signal processing circuit 15 delivers a command to stop the recording action of information or to record the information another track 28. Then the information reproduced by the 3rd spot 22 is compared with the information held by the circuit 15 holding the preceding information by a track. Thus the correct or wrong recording of information is decided.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for recording and reproducing optical information that allows the recording surface of an optical disc to be inspected before and after recording information. be.

L. Prior Art] FIG. 3 is a block diagram showing a conventional optical disk device. In the figure, (1) is an optical disk provided with concentric or spiral guide tracks so that information can be recorded, and (2) is a light source for recording information on the optical disk (1) and reproducing the recorded information. A semiconductor laser diode (hereinafter referred to as a light emitting device) that outputs light that is a beam splitter that reflects parallel light toward the recording surface of the optical disc (1) and transmits the light reflected by the optical disc (1);
(5) from the beam splitter (4) to the optical disk (1)
(6) is a half mirror 1 that splits the light reflected by the optical disk (1) and transmitted through the beam splitter (4) into first light and second light.
(7) is a condensing lens that focuses the first light, and (8) is a photoelectric conversion element that converts the focused first light into an electrical signal to detect the focused light, track deviation, and data signal. . (9) is a processing circuit that receives the electrical signal from the photoelectric conversion element (8) and reproduces the data signal and corrects the track deviation; Qo is a tracking actuator for correcting the track deviation that operates according to the commands of the processing circuit (9); (B) is a second condensing lens that focuses the second light, and (B) is a photoelectric conversion element that converts the focused second light into an electrical signal to detect a focus shift. (1) is a processing circuit that receives electrical signals from the photoelectric conversion element port and corrects focus deviation; (141 is a focus lens actuator that operates according to commands from the processing circuit port; (7) processes signals for recording and reproducing information. αQ is a rotating device that rotates the optical disk (1), aη is a control circuit that controls the rotation speed of the rotating device,
) is a focused spot.

Next, the operation will be explained. When the control circuit ση drives the rotating device Ql and drives the 1 light emitting element (2) so that the optical disc (1) rotates at a predetermined rotational speed, the spot is focused on the center of the track of the optical disc (1). Thus, tracking control and focus lens control are performed, and it becomes possible to record information on the optical disc (1) or reproduce recorded information.

When recording (writing) information onto the optical disc (1), the signal processing circuit (g) applies modulation to the light emitting element (2) in accordance with the information recording, and physically or chemically reflects reflected light onto the optical disc (1). The optical disc (
1) Information is recorded on the recording surface by thermal or magnetic means. (The recorded modulation part is called a pit.) Also, when reproducing (reading) information from the bits of the optical disc (1), the optical output of the light emitting element (2) is applied to the optical disc (1) to the extent that it does not change. Lower.

Changes in the reflected light given to the optical disk (1) during information recording (data writing), that is, recorded information corresponding to the recorded information, are reproduced by the photoelectric conversion element, the processing circuit, and the signal processing circuit 4.

[Problems to be Solved by the Invention] Conventional recording and reproduction of optical information is performed as described above. There was a problem in that it took a long time to perform a subsequent verify read check.

This invention was made in order to solve the above-mentioned problems, and in parallel with recording information, it detects the state of the track before the information is recorded and whether the recorded information is correct or incorrect. This is what I did.

[Means for solving problems]

The method for recording and reproducing optical information according to the present invention divides the output light of a light emitting element into eight parts to form first, second and third spots, and irradiates each spot onto each adjacent track of an optical disc. , record information at the first spot, and record the information at the second spot.
The third spot detects the state of the track before recording information, and the third spot reproduces the information recorded by the first spot.

[Function] The optical information recording/reproducing method according to the present invention records information at a first spot and detects the state of the track before the information is recorded at a second spot.

The information recorded at the third spot is reproduced.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. @1
In the figure and FIG. 2, (1) to μs are the same as the conventional ones, but for convenience of explanation, (8) is the first photoelectric conversion element, (9) is the first processing circuit, and (g) is the first photoelectric conversion element. is called the first spot, A is a photoelectric conversion element that monitors the amount of light emitted by the light emitting element (2), and (7) is a diffraction grating or beam splitter that divides the light parallelized by the collimator (3) into three parts. (b) is a beam splitter (4) and a condensing lens (5).
) is the second spot focused on the recording surface of the optical disk (1), and ■ is the third spot focused on the recording surface of the optical disk (1) by the beam splitter (4) and the condensing lens (5). be. Here, the first to third spots a8cl! υ@ is irradiated onto adjacent tracks (to), which will be described later, of the optical disc (1), with the first spot (g) as the center and the second spot ? υ is arranged so as to irradiate a track before the first spot (g), and a third spot (l) to irradiate a track after the first spot (g). ■ is a second photoelectric conversion element that converts the light from the second spot (c) reflected by the optical disc (1) into an electrical signal; ■ is the second photoelectric conversion element that converts the light from the third spot (c) reflected by the optical disc (1). A third photoelectric conversion element that converts into an electrical signal, @ is a second photoelectric conversion element (2)
a divider that calculates the output of the photoelectric conversion element σ field and the output of the photoelectric conversion element σ field;
(e) is a divider that calculates the output of the third optical conversion element (goods) and the output of the photoelectric conversion element α field; (a) is each divider (
e) A check data reading circuit that receives the output of (a),
It is configured to send the read results to a signal processing circuit (to). , @ are tracks formed on the recording surface of the optical disc (1), and (g) are pits on which information is recorded.

In the device shown in Fig. 1, when the optical disc (υ) is rotated to drive the light emitting element (2), one of the lights emitted by the light emitting element (2) is made into parallel light by the collimator (3) and sent to the spectroscopic element. The other light is divided into 8 parts by 4, and the other light is sent to photoelectric conversion element a.
9 into an electrical signal.

The light divided into eight by the spectroscopic element (1) is reflected in the direction of the optical disk (1) by the beam splitter 4, and is formed on the recording surface of the optical disk (1) by the condenser lens tI4. focused on the first spot (g)
A second spot (A) and a third spot (I) are formed.

Here, the operation path when recording (writing) information at the first spot (g) is α9→(2) −(3)→
■-(4) → (5) → (g) → (1) = (c), playback (
The readout path is Kan→@-4(1)→(to)→(5)→(
4) → (6) → (7) → (8) → (9) → (g), the focusing path is (to) → (1) → rabbit → (5) → (
4) → (6) → aυ → 4 → mouth → α4, the tracking path is ■ → (1) → (to) → (5) → (4) → (6) → (
7)→(8)→(9) The rotation control path of the 401% optical disk (1) is αη→QQ→(1), which are the same as before, so their explanations will be omitted.

Next, the second spot opening and the third spot (a) will be explained. When recording information on the track (branch) at the first spot (to), as shown in Fig. 2.

The second spot is irradiated onto a track (28a) on which no information is recorded one track before the first spot, and the third spot is one track after the first spot. The track (28b) having the fourth pit in which the information of is recorded is irradiated with light. Therefore, the state of the track C28a) on which information is to be recorded, that is, the presence or absence of already recorded information and whether or not information can be recorded, is detected at the second spot opening, and when information recording is possible, the first spot (C28a) is detected.
To) information is recorded on the track (28g), pit 4 is formed, and the information recorded in pit 4 is reproduced at the spot opening @8.

Here, the light irradiated onto the optical disc (1) and reflected from the optical disc (1) is reflected by the second and third spots Qll(a), respectively, into the second and third photoelectric conversion elements.
is converted into an electrical signal by
(E) is divided by the output signal of the photoelectric conversion element Ql, and level compensation is performed by the first spot (G). In this way, the second spot opening is divided by the output signal of the photoelectric conversion element Ql.
detects the state of the top of the track prior to the track (e) on which information is to be recorded, and when it detects that the information has been recorded inappropriately, such as information being already recorded, a predetermined command is issued from the check data reading circuit. As a result, the signal processing circuit head issues a command to stop recording information on the first spot (g), or outputs a command to record on another track.

Further, the information reproduced by the third spot opening is compared with the information of one track before, which is held by the signal processing circuit, and it is determined whether the recording is correct or incorrect.

Therefore, if the reproduction result is correct, recording of information by the first spot (to) is continued. Note that if it is determined that the reproduction information of the third spot opening is incorrect.

The signal processing circuit (g) corrects the recording in the error correction unit by a correction command if it is correctable, and if it is an uncorrectable record, it rerecords it on the spare sector or spare track using the first spot (to). Output the command.

Note that when reproducing the information recorded on the pit wire (in the first spot), the second spot opening and the third spot (A) are not used.

〔Effect of the invention〕

As described above, according to the present invention, the output light of the light emitting element is divided into eight parts so that the first spot records and reproduces information, and when the first spot records information, the second spot The spot detects the state of the information recording surface before the first spot, and reproduces the information recorded in the first spot with a third spot following the first spot to correct or correct the recorded information. Since errors are detected, reliability and accuracy of information records are improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an optical disk device according to an embodiment of the present invention, FIG. 2 is an enlarged view of the optical disk, and FIG. 3 is a block diagram of a conventional optical disk device. In the figure, % (1) is an optical disk, and (2) is a light emitting element. Bright is the @1 spot, (7) is the spectroscopic element, @ is the second spot, % (2) is the third spot, and (c) is the track. Note that the same reference numerals in each figure indicate the same or equivalent parts.

Claims (1)

[Claims] (1) In a method of recording and reproducing optical information by irradiating a focused spot of the output light of a light emitting element onto a track of an optical disk, the output light of the light emitting element is divided into three parts and a first spot and a second spot are used. and a third spot, and each of the spots is irradiated onto each of the adjacent tracks of the optical disc, the first spot records information, and the second spot is formed to record information from the first spot. A method for recording and reproducing optical information, characterized in that the state of a track one track before is detected, and the third spot reproduces information recorded in the first spot.